So i've heard mixed reviews about the two tires, and i'm torn between which one I want to buy. They will only be used for autocross..not for daily driving. I usually autocross about 5 times per season..and i'm sick of using my street tires. The price difference between the two is $10. Can i get some opinions on which ones you guys prefer..thanks!

 

The RT-615K just came out and I doubt that many people have tried them yet...

 

yeah that's kind of what I figured but is no one running the kumho xs?

 

A lot of people are. It's excellent in dry, not so great in wet.

Depending on what size you need, you should also consider the Dunlop Direzza Sport Z1 Star Spec, Bridgestone Potenza RE-11, Yokohama Advan Neova AD08, and Toyo Proxes R1R. If you're using 215/45-16, don't forget that 205/45-16 will work equally well, which opens up the RE-11 and R1R.

 

great video review

i have the RT-615 on my itr and they r really good best wheels i ever had

http://www.youtube.com/watch?v=JrlfZ...ayer_embedded#!

 

Lol the mustang took off with the 615k stickers still on the tires. Nice to see an actual improvement though. A comparison with the current top dog steets tires would be nice as well.